Table 6: AChE biosensor using quantum dots as immobilization support.

Mode of detectionTransducerEnzyme immobilization methodMinimum detection limitLinearity Substrate/enzyme inhibitorTime of incubation
(min)
Storage stability
(days)
Reference

ElectrochemicalAuNPs-SiSG/GCEHydrogen Bonding0.44 μMNRMonocrotophos1030[73]

AmperometricCdTe QDs/AuNPs/CHIT/GCECovalent Bonding1.34 μM4.4 × 10−3–4.48 and 8.96–67.20 μMMonocrotophos830[89]

OpticalCdTe-QDs/GlassElectrostatic interaction1.05 × 10−5 and 4.47 × 10−6μM1.0 × 10−6–1.0 and 1.0–0.1 μMParaoxon
Parathion
1535[90]

Fluorescence quenchingMn: ZnSe d-dotsNR 1.31 × 10−11 mol 4.84 × 10−11 to 4.84 × 10−6 mol/LParaoxon 10NR[91]

AmperometricCdTE QDs/Au electrodeCovalent Bonding2.98 × 10−3μM4.96 × 10−3–2.48 μMCarbyl1030[92]

Note: NR: not reported.